File Metadata

Created: Thu, Sep 25, 6:25 PM

Axis.php
View Options

	<?php
	/* Libchart - PHP chart library
	* Copyright (C) 2005-2007 Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 3 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	*/

	defined('FULL_PATH') or die('restricted access!');

	/**
	* Automatic axis boundaries and ticks calibration
	*
	* @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
	*/
	class LibchartAxis {
	private $min;
	private $max;
	private $guide;
	private $delta;
	private $magnitude;
	private $displayMin;
	private $displayMax;
	private $tics;

	/**
	* Creates a new axis formatter.
	*
	* @param integer minimum value on the axis
	* @param integer maximum value on the axis
	*/
	public function __construct($min, $max) {
	$this->min = $min;
	$this->max = $max;

	$this->guide = 10;
	}

	/**
	* Computes value between two ticks.
	*/
	public function quantizeTics() {
	// Approximate number of decades, in [1..10[
	$norm = $this->delta / $this->magnitude;

	// Approximate number of tics per decade
	$posns = $this->guide / $norm;

	if ($posns > 20) {
	$tics = 0.05; // e.g. 0, .05, .10, ...
	} else if ($posns > 10) {
	$tics = 0.2; // e.g. 0, .1, .2, ...
	} else if ($posns > 5) {
	$tics = 0.4; // e.g. 0, 0.2, 0.4, ...
	} else if ($posns > 3) {
	$tics = 0.5; // e.g. 0, 0.5, 1, ...
	} else if ($posns > 2) {
	$tics = 1; // e.g. 0, 1, 2, ...
	} else if ($posns > 0.25) {
	$tics = 2; // e.g. 0, 2, 4, 6
	} else {
	$tics = ceil($norm);
	}

	$this->tics = $tics * $this->magnitude;
	}

	/**
	* Computes automatic boundaries on the axis
	*/
	public function computeBoundaries() {
	// Range
	$this->delta = abs($this->max - $this->min);

	// Check for null distribution
	if ($this->delta == 0)
	$this->delta = 1;

	// Order of magnitude of range
	$this->magnitude = pow(10, floor(log10($this->delta)));

	$this->quantizeTics();

	$this->displayMin = floor($this->min / $this->tics) * $this->tics;
	$this->displayMax = ceil($this->max / $this->tics) * $this->tics;
	$this->displayDelta = $this->displayMax - $this->displayMin;

	// Check for null distribution
	if ($this->displayDelta == 0) {
	$this->displayDelta = 1;
	}
	}

	/**
	* Get the lower boundary on the axis3
	*
	* @return integer lower boundary on the axis
	*/
	public function getLowerBoundary() {
	return $this->displayMin;
	}

	/**
	* Get the upper boundary on the axis3
	*
	* @return integer upper boundary on the axis
	*/
	public function getUpperBoundary() {
	return $this->displayMax;
	}

	/**
	* Get the value between two ticks3
	*
	* @return integer value between two ticks
	*/
	public function getTics() {
	return $this->tics;
	}
	}

Axis.php
No OneTemporary
Actions

File Metadata

Axis.php
View Options

Event Timeline

Axis.phpNo OneTemporaryActions

File Metadata

Axis.phpView Options

Event Timeline

Axis.php
No OneTemporary
Actions

Axis.php
View Options